Bones wheels uses only the highest quality urethane for their wheels, making for a product that offers greater slidability, higher resistance to flat spotting and a faster roll. The Bones Popo Skatepark V4 84b Skateboard Wheels are designed, and manufactured in the USA and Bones stands behind its products for the useful life of the product.
Skatepark Formula™ (SPF) This is a very high quality urethane specifically formulated to resist flatspotting on slick or smooth surfaces while maintaining a higher rebound for a quicker response and a faster roll. It has a high resistance to abrasion while not compromising hardness and slide ability. Skatepark Formula wheels grip better on slick surfaces, are almost impossible to flatspot, and are the fastest, longest lasting wheel on the market today.